Field Experiment on the Migration of Fishes to a Paddy Field with a Small Fishway

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text
36-04-05.pdf1.17 MB

Medaka (Oryzias latipes) populations have recently declinedto such alevel that they are listed as a species in danger of extinction in the Red Data Book. And a decline in the numbers of catfish and loach has been reported in various parts of Japan. One cause of their decline is the increase in the drop height between paddy fields and water channels, particularly drainage channels. For catfish, loach,and medaka, paddy fields are important spawning grounds or habitats. This report describes the results of a study conducted by the construction of an experimental fishway that fish can use to migrate into an idle paddy field beside Lake Kasumigaura and for the observation and determination of the actual migration of fish swimming through the fishway during a 2-year period from 1997 to 1998. It was observed that immediately after the opening of the sluice gate between Lake Kasumigaura and the channel, the number of fishes migrating to the experimental site, which were assumed to have been carried by water flowing from the Lake, reached a peak.

Date of issued
Creator HATA Kenji
Subject

biological diversity

paddy irrigation systems

fish protection

Publisher Japan International Research Center for Agricultural Sciences
Available Online
NII resource type vocabulary Journal Article
Volume 36
Issue 4
spage 219
epage 225
DOI 10.6090/jarq.36.219
Rights Japan International Research Center for Agricultural Sciences
Language eng

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